Finding the Fourth Proportional to 2,578.56, 3,886.87 and 2,428.03

Step by Step Solution

1. Step 1: Write the proportion equation
   2,578.56 : 3,886.87 = 2,428.03 : x
2. Step 2: Convert to fraction form
   2,578.56/3,886.87 = 2,428.03/x
3. Step 3: Cross multiply
   2,578.56x = 3,886.87 × 2,428.03
4. Step 4: Simplify right side
   2,578.56x = 9,437,436.97
5. Step 5: Solve for x
   x = 9,437,436.97/2,578.56
6. Step 6: Final answer
   x = 3,659.96